Metalworking



Nov. 10, 1936. I s, s, BURGEY' 2,060,024

METALWORKING Filed Dec. 9, 1935 Inventor Patented Nov. 10, 1936 PATENT OFFICE METALWORKING Samuel S. Burgey, United States Army, Pedricktown, N. J.

Application December 9, 1935, Serial No. 53,631

4. Claims.

(Granted under the act of March 3,1883, as

amended April 30, 1928; 370 O. G. 757) In using the container method of cold working,

as outlined in Patents Nos. 1,553,824 and 1,553,825 issued September 15, 1925, to F. C. Langenberg, it has been necessary to design the gun or other piece to be cold worked, with a cross section which decreased from one end throughout the length of the piece. As an example, it has been necessary to design a gun for cold working as a truncated cone, or series of truncated cones on the outside, the cones all tapering toward one end, the diameter of the gun thus decreasing from one end to the other. This was necessary to permit the gun to be inserted into the container before cold working, and to be removed from the container after cold working.

In the case of a gun which in its finished condition would contain a cylindrical section as part of its outer surface, it has been necessary to leave additional metal for the cold working process, to make a conical section of the cylindrical 39 section, machining ofi the excess metal after removal from the container.

If a cylindrical section is cold worked in a cylindrical container, such intimate contact is established between the object being cold worked and the container, and the container grips the object with such pressure that it is impossible to force the object from the container, if of appreciable length.

It has also been impossible heretofore to cold work in a container any object having a projection, either circumferential or longitudinal for part of its length.

By enclosing the object to be cold Worked in a removable liner, the inside of which has been formed to the shape and dimensions to which it is desired to expand the object to be cold worked, and by forming the outside as a truncated cone, or series of truncated cones to fit the container, guns or other objects of any desired shape may be cold worked to such final dimensions and shapes as to eliminate the necessity for further removal of metal from the outside.

The removable liner may be of one or more 55 pieces, divided longitudinally or transversely, to

facilitate the insertion or removal of the gun or other object to be cold worked.

A taper sufficient to insure easy withdrawal or ejection of the liner from the container should be used in forming the outside of the liner and 5 inside of the container. The container should have walls of sufiicient strength to prevent excessive enlargement of the liner through elastic expansion of the container. The liner should preferably be made of material with a hardness 10 greater than that of the container to avoid seizing between the liner and container, and scoring of the surfaces. The outside of the liner shall be greased before insertion in the container, and grease grooves and/or holes in the liner should 15 connect with grease grooves and/or holes in the container to permit grease on the gun or other object, as well as grease between the liner and container, to flow to the outside of the container, the cessation of the flow of grease being an indication that the gun or other object has reached its final cold worked dimensions.

Practical liners are illustrated in the accompanying drawing, wherein:

Fig. 1 is a longitudinal section through a con- 25 tainer and liner.

Fig. 2 is a similar view showing a liner with a different interior contour.

Fig. 3 is a section on the line 33 of Fig. 1.

Referring to the drawing by numerals of refer- O ence:

There is provided a container 4 having an opening 5 therethrough the walls of which taper from one end to the other so as to permit easy removal of an object therefrom. The container 5 is similar to the container shown and described in Patent No. 1,553,824, issued September 15, 1925, to F. C. Langenberg. Within the container may be placed a liner 6, as herein shown divided in part longitudinally and transversely as indi- 40 cated at l and 8 respectively to permit the work 9 to be readily placed therein and removed therefrom. The interior walls of the liner conform to the exterior wall of the finished product so that little or no machining has to be done thereon.

In Fig. 1 the same container 4 is illustrated but the liner 6 is of different interior contour to conform to the exterior of the Work 9 In this instance the liner is divided longitudinally (as at l as the shape of the finished product would not permit the removal of any portion of the liner by a movement axially of the work. As shown herein grease holes H] are provided in the liner registering with grease grooves II in the container to permit grease to be expelled from the container through grease hole l2 as the work is expanded.

The method of operation is as follows: The Object to be cold worked is placed in a liner having an interior contour complemental to the exterior of the finished product, the liner is then inserted in the container and pressure applied to the interior of the object in the usual manner.

When the object has been sufiiciently cold worked the liner is removed and separated to allow the finished product to be easily removed.

The work is preferably greased before being placed in the liner and the liner greased prior to insertion in the container.

I claim:

1. A method of cold working hollow objects embodying placing the object in a sectional form, placing the form in a container, applying pres sure to the interior of the object to expand the same into contact with the walls of the form, then removing the form from the container, and disassembling the form.

2. The combination with a container for cold working hollow objects, of a separable liner having a close removable fit in the container, the interior contour of the liner complemental to the exterior contour of the finished product.

3. The combination with a container having a tapered opening therein, of a separable liner, the exterior surface of the liner tapered to engage the opening with a close removable fit, the contour of the interior of the liner complemental to the contour of the exterior of the finished product.

4. The combination with a container for cold working hollow objects of a separable liner adapted to be received within the container with a removable fit.

SAMUEL S. BURGEY. 

